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Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended		6 Months Ended
Stock-Based Compensation (Details Textual) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock Based Compensation (Textual) [Abstract]
Weighted average grant-date fair value per share of the restricted stock units awarded	$ 5.75	$ 5.86	$ 5.52	$ 9.87
Unearned stock-based compensation	$ 15,800,000		$ 15,800,000
Weighted-average period over which the unearned stock-based compensation is expected to be recognized, years			1 year 3 months 18 days
Stock-based compensation expense excluding acceleration of Veloce warrants	7,634,000	3,124,000	15,323,000	7,302,000
Stock-based compensation expense related to the acceleration of Veloce warrants			$ 1,289,000
Minimum [Member]
Stock Based Compensation (Textual) [Abstract]
Estimated forfeiture rate used in determining the amount of stock-based compensation			6.80%
Maximum [Member]
Stock Based Compensation (Textual) [Abstract]
Estimated forfeiture rate used in determining the amount of stock-based compensation			6.60%

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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